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Subject[PATCH 1/2] mm: Mark nr_node_ids __ro_after_init
Just like nr_cpu_ids, nr_node_ids covers the side of possible_map and
is thus constant after init.

Mark the variable __ro_after_init to both improve performance and
enhance security, since the variable is exported. A module writing to
it would be 'unfortunate'.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -305,7 +305,7 @@ int movable_zone;
EXPORT_SYMBOL(movable_zone);

#if MAX_NUMNODES > 1
-unsigned int nr_node_ids __read_mostly = MAX_NUMNODES;
+unsigned int nr_node_ids __ro_after_init = MAX_NUMNODES;
unsigned int nr_online_nodes __read_mostly = 1;
EXPORT_SYMBOL(nr_node_ids);
EXPORT_SYMBOL(nr_online_nodes);

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